Endeavour to Offer Up to $110 Million in Notes

Endeavour International Corporation today announced that it intends to offer, subject to market and other conditions, up to $110 million aggregate principal amount of its convertible senior notes due 2016 in a private placement to eligible purchasers. Endeavour also intends to grant to the initial purchasers of the notes an option to purchase up to an additional $15 million of notes to cover over-allotments, if any.

Endeavour intends to use substantially all of the net proceeds of this offering to fund its pending acquisition of acreage and related midstream assets in the Marcellus shale play. The remainder, if any, will be used for general corporate purposes, including funding a portion of Endeavour's 2011 capital program.

This press release is neither an offer to sell nor the solicitation of an offer to buy the notes or any other securities. The notes will be offered in the United States only to qualified institutional buyers in reliance on Rule 144A under the Securities Act of 1933 (the "Securities Act"). The notes have not been registered under the Securities Act and may not be offered or sold in the United States without registration or an applicable exemption from registration requirements. This announcement is being issued pursuant to Rule 135c under the Securities Act and shall not constitute an offer to sell or the solicitation of an offer to buy any securities.